I don't have bought any of these minerals yet, so I can't tell. I just have seen some so called "gediegen arsen", what translates like "sterling arsenic" on German eBay. On pictures it lookes like dark grey mineral, maybe similar to earth. Sometimes it have inclusions of silver in it. It is a local mineral from Ore Mountains in Saxony. Alas, I haven't saved any pictures, and at the moment there is none of it offered...
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